Milling tool



l Patented Apr. 5, 1927.

LAWRENCE LENHARDT, OF SPENCERPORT, NEW YORK,

ASSIGNOB OF ONE-HALF T FRANK DE FELICE, 0F ROCHESTER, NEW YORK.

MILLING TOOL.

Application led July 14,

This invention relates to a milling tool,

' the general object of the invention being to provide a Itool that will cut smoothly and straight, one that will not fill up with metal and one which will not be increased in size by sharpening.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, lto be hereinafter fully described, illustrated in the accompanying drawings and Y ,specifically pointed zout in the appended claims.

In describing my invention in detail, reference will be had `to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is an elevation of the device.

Figure 2 isan end View thereof.

Figure 3 is a section on line 3 3 of Figure l. v l

In the drawings, l indicates the head of the tool which is made hollow and which is '25 formed with the cutting teeth 2. The insidel diameter of the head` is practically straight p and the inner walls are formed with the flutes or recesses 4 which form internal teeth 5. These teeth 5 are shaped so as to form a cutting edge with clearance, shown at 6.

The operationy of this tool is as follows As the metal is cut by the surfaces 2, it is broken up in chips. The breaking up of these metal chips and the friction produced by the cutting surfaces2 produce a fine metal dust and as the metal enters the interior ofthe ldust immediately 1926. Serial No. 122,423.

head, it carries some of the metal dust along y Instead of this dust causing exceswith it. sive friction and the filling up of the interior of the head as in tools now made, the metal drops into the flutes 4, where it is out of the way, and should the metal have a tendency to expand, which Would cause friction, the cutting edge of the internal teeth 5 will cut the metal away and keep it from producing friction, as shown in figure 3, where the metal core is shown at It is thought from the foregoing description that the advantages and novel features of myinvention will be readily apparent.

I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the vappended claims.

. What I claim is 1. A milling tool comprising a hollow head having teeth formed at its free end an'd -having curved recesses formed in its inner wall to provide teeth for cutting an object entering the interior part of the head.

i 2. A milling tool comprising a hollow head having teeth formed at its free end and having curved recesses formed in its inner wall to provide teeth for cutting an object entering the interior part of the head, the` bore of the head being'of the same diameter A I throughout its lengt 'In testimony whereof I affix my signature.

LAWRENCE LENHARDT. 

